Mechanical-stoking grate.



No. 837,641. Y PATENTED DEG. 4, 1906.

H.A.' POPPENHUSEN.

MECHANICAL STOKING GRATE.

APPLIUATIQN num snm. 2o, 1904.' N

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n I \\I No. 837,641. I ATENTED-DBG. 4.,v 1906. H. A. PPPENHUSEN.

MECHANICAL sToKING GRATE.

APPLIOATIGN FILED SEPT. 20, 1904.

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PATENTED DEG. 4, 1906.

H. A. POPPENHUSEN.

MEGHANIGAL sToKING GRATE..

APPLIOATION FILED SEPTJO, 1904.

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vnl.l NoRnls PETER: fm.. wAsHlucfaN. n. c,

PTENTED DEC. 4, 1906.

IL A. PPPENHUSEN. MECHANICAL STOKING'GRATE.

APPLICATION FILED SEPT. 20, 1Q04.

7 SHEETS-snug.

sns co4. wAsmNdraN u c No. 837.641. y PATBNTED DEG. 4, 1906.y H. A.POPPENHUSEN.

, MECHANICAL STOKING: -GRATB APPLIUATION FILED 52212.20, 1904.

7 SHEETS-SHEET 5.

No. 837,641'. PATBNTED DEG. 4, 1906. H. A. PQPPBNHUSBN.

-MECHANICAL STOKING GRATIS.

APPLIOATIONJILBD SBF120, 1904.

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No. 837,641. PATENTED DBC. 4, 1906.

H. A. POPPENHUSEN.

MECHANICAL STUKING GRATE. irrnlonlon FILED snm?. 2o. 1904.

7 SHEETS-SHEET 7.

MINIMUM; 3

. l A All" i UNITED STA'TFS FA'IFNT OFFICE.

#fn- HERMAN A. POIPENHUSEN, OF EVANSTON, ILLINOIS.

MECHANICAL-STOKING GRATE.

Specification of Letters Patent.

Patented Dec. 4, 1906.

Application filed September 20, 1904:. Serial No. 225,204.

To /LZZ whom, it may concern:

Be it known that I, HERMAN A. PorrnN- nUsEN, of Evanston, in the countyof Cook and State of Illinois, have invented certain new and usefulImprovements in Mechanical- Stoking Grates and I do hereby declare thatthe following is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon, which form a part of this specification.

This invention relates to mechanical stokers or devices which operate toeffect the continuous movement or feed of the layer of fuel resting onthe grate along the supporting-surface of the grate in a direction fromthe feed-opening of the furnace inwardly or toward the interior thereof;and it embraces a mechanical-stoking grate in which the gratebars have acombined reciprocatory and rocking movement.

The invention consists in the matters hereinafter described, and pointedout in the apended claims.

In the accompanying drawings I have illustrated as applied to asteam-boiler furnace a mechanical-stoking grate embodying my inventionin the best form in which I have as yet been able to devise the same;but it is to be understood that said drawings illustrate only one ofvarious forms in which a structure embodying the essential features ofmy invention may be constructed.

As illustrated in said drawings, Figure 1 is a view in centrallongitudinal section of a steam-boiler furnace equipped with amechanical-stolring grate constructed in accordance with my invention.Fig. 2 is a plan view of the furnace-grate and operative parts therefor,the grate-bars constituting the supporting-surface of the grate being inart removed to illustrate the construction of the parts beneath saidgrate-bars, by which the same are supported. Fig. 3 is an enlarged sideelevation ofthe parts at the front ofthe furnace through which thegratebars are actuated. Fig. 4 is a detail front elevation of thedevices shown in Fig. 3, -showing the actuating devices at one side ofthe grate. Fig. 5 is a detail transverse section through a part of thegrate and one of the side walls of the furnace, taken on line 5 5 ofFig. 1. Fig. 6 is a detail perspective view of some of the bars of theupper sets of supporting-bars by which the grate-bars are sustained andactuated. Fig. 7 is a like del tail perspective view of the rear ends ofsome of the bars of the lower sets of supportingbars. Fig. S is anenlarged detail sectional view showing in side elevation the forward lends of two adjacent supporting-bars, illustrating the means forconnecting the same with the devices by which said supportingbars aregiven endwise movement. Fig. 9 is a detail cross-section taken upon line9 9 of Fig. 3. Figs. 10 to 14 are views in side elevation of thegrate-bar-actuating devices for one set of grate-bars, illustratingdifferent positions of said parts. Fig. 15 is an enlarged detail sideview, with parts in section, of one of the grate-bars and thesupportingarm by which it is immediately sustained, this figureillustrating certain details of construction in these parts not shown inthe precedingnseveral views. Fig. 16 is of the parts shown in Fig. 15.Fig. 17 is a detail cross-section taken on line 17 17 of Fig. 15. Fig.18 is a plan view of the grate-bar shown in Figs. 15, 16, and 17.

As illustrated in said drawings, A A indicate the side walls of thefurnace, A the bridge-Wall at the rear of the furnace, A2 an ignition orcombustion arch which extends across the forward part of the furnace adjacent to the feed-opening thereof, and A3 a wall which rises from therear margin of the ignitionarch A`-.

B indicates a steam-boiler of the ywatertube type, having a head B/ andwater-tubes b I). The head B is shown as being located over and incontact with the wall A3 and the water-tubes b l) as extendingrearwardly therefrom over the bridge-wall A.

C indicates a feed-hopper by which fuel is fed to the forward or feedopening of the furnace and is sup plied in a uniform layer to the grate.Said feed-hopper embraces two parallel side plates C C and an oblique orinwardly-inclined front plate C2, which extends between and isconnectedv at its side margins with the side plates C C. The side platesC C are shown as being extended downwardly to the floor-level and asforming supports for some of the operative parts of the grate mechanism.

\ I) indicates a sliding gate or fuel-door located over the feed-openingof the furnace between the front end of the ignition-arch A2 and thefuel-hopper C. Said gate D, as shown, consists of a transverse giiderD', to

l the rear face of which, is secured a row of firel brick d, saidfire-brick being located between an end view.

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together the girder D and the front edge of the ignition-arch A2. Aplate d is attached to the outer face of the girder D and extendsdownwardly and inwardly to the lower margins of the fire-brick d. Saidplate d forms the rear wall of the hopper C. The ends of the said gate Dare supported in suitable guides formed on the inner face of the sideplate C of thefeed-hopper.

The grate of the furnace illustrated is located within the furnace, withits forward end extending outwardly therefrom beneath the feed-hopper,and said grate, as shown, is arranged horizontally, although it may bemore or less inclined from front to rear, either downwardly or upwardly,if desired.

E E E indicate the grate-bars, which form the fuel-supporting surface ofthe grate. The said grate-bars are arranged in rows, extending from thefront to the rear of the furnace, with the individual bars parallel withthe side walls of the furnace and the bars in each row in end-to-endrelation. Said bars have severally both an endwise reciprocatory and arocking movement, and all of the bars in each row are adapted to move intheir endwise reciprocation, while the bars in each row have asimultaneous rocking movement, by which their rear ends are alternatelylifted above and dropped to the general level of the fuel-supportingsurface of the grate. Moreover, the bars in the alternate, or first,third, fifth, seventh, and ninth, ctc., rows of bars constitute a set ofbars which are connected and move together, while the bars in theintermediate, or second, fourth, sixth, eighth, tenth, &c., rowslikewise constitute a set ofbars which are connected and move together,while the movements of the bars in each set take place in alternationwith the movements ofthe bars in the other set. Furthermore, the devicesfor giving reciprocatory and rocking movement to the grate-bars are soarranged that the rear ends of all of the bars in each set will belelevated when the bars are moving rearwardly and depressed whenl thebars are moving forwardly, and also in such manner that when the barsvofone set are elevated at their rear ends the bars of the other set,constituting the intermediate rows of bars, will be depressed, with theresult that when the rows of bars constituting either set of bars arerocked to carry their rear ends upwardly said rear ends will enter thel'ayerof fuel on the grateJ` and in the rearward movement of that setwill carry the fuel rearwardly over the intermediate bars of the otherset, which at that time will be in their depressed positions. Nowreferring to the means by which the said grate-bars are supported, eachbar E is provided with a downwardly-extending supporting-arm E, which isrigidly attached thereto and by which it is pivotedly or movablysustained in such manner that when it .ends to said is swung oroscillated about the pivot of said arm E its rear end will have agreater vertical movement than its front end.

F F indicate a set of endwise-movable supporting-bars which are arrangedside by side in parallel relation and to which are pivoted the lowerends of the supporting-arms E E of the grate-bars, constituting thefirst, third, fifth, seventh, &c., rows of bars. F F indicate a like setof supporting-bars arranged parallel with and between the bars F F andto which are pivoted the lower ends of the supporting-arms E E,belonging to the intermediate or second, fourth, sixth, eighth, &c.,rows ofgrate-bars. The pivots joining the lower ends of the arms E Ewith the bars F and F are located beneath or nearly beneath the forwardends of the bars, so that when the bars are rocked forwardly andupwardly from the horizontal position thereof the rear ends the generallevel of the top of the grate, while their forward Aends will havelittle or no vertical movement. The individual bars are, moreover, madeof such depth or width vertically at their rear ends that when said rearends are elevated above' the front ends of adjacent bars the rear edgesof the bars will still extend below or overlap the said front ends ofadjacent bars, and no openings or spaces will be left between the endsof adjacent bars when the rear ends of the bars are. so elevated. Asshown and preferably made, the bars are much wider at their rear than attheir forward ends, or of generally triangular form, as seen in sideview. The set of supporting-bars F F F are rigidly connected at theirends, so as to form a grid, which is given reciprocatory movement in adirection endwise ofthe individual bars, so that the said set of bars FF F constitute supports for and means for giving endwise reciprocatorymovement to the set of grate-bars supported thereby or connectedtherewith. Likewise the set of supporting-bars marked F F are rigidlyconnected to form a grid and likewise have endwise reciprocatorymovement. In a plane at some distance below that of the bars F F F islocated a set of bars G G G and a set of intermediate bars G G G, thebars constituting each of said sets of bars being connected at theirends to form two separately-movable grids in the same manner as in thecase of the sets of bars F F and F FF. The supporting-bars G and G areseverally connected with the individual grate-bars above them by meansof links E2, which are pivoted at their upper ends to the said gratebarsat points at the rear of the upper ends of the arms E and are pivoted attheirlower bars G and G. The two upper sets of bars F F and the twolower sets of bars G G together constitute supports for the grate-barsconnected therewith, and also through the endwise movement of both theof the bars will be lifted above` IOC upper and lower sets of barsconstitute means for transmitting endwise reciprocatory movement to thesaid grate-bars. Said arms E' and links are relatively so arranged thatwhen the said bars G or G are moved forwardly relatively to theassociated upper bars F or F the gratebars will be tilted rearwardly onthe pivots of the arms E', but when the said bars G or G' are movedrearwardly relatively to the bars F or F' the grate-bars will be tiltedforwardly on said pivots. lt follows that the two sets of upper andlower bars F F' and G G' also serve, through the relative endwisemovement thereof, to give rocking movement to the grate-bars.

Referring to the details of construction illustrated in the connectingmeans between the grate-bars and the supporting-bars F F and G G', Fig.5, the arms E on the gratebars are split or forked at their lower endsto embrace the bars F F', which are vertically wide and flat, and saidarms are connected with the said bars F F by pivots extending throughthe bars and through the lower ends of the forks of said arms. The linksE2 are arranged in pairs, withthe two bars of each pair pivoted to asingle grate-bar and extending downwardly at opposite sides of the upper bars F F. rI he lower ends of the two bars of each pair overlap thebars G G at their lower ends and are connected with the latter by pivotswhich pass horizontally through the said bars G G' and said links. Attheir upper ends the two links E2 of each pair are arranged at oppositesides of an apertured lug c, which projects downwardly from the undersurface of the grate-bar E and which is preferably made integral withthe arm E' in a manner and for a purpose more particularly hereinafterdescribed.

Now referring to the means for joining or connecting with each other toform the grids hereinbefore referred to the individual bars constitutingthe f our sets of bars F F F' F' G G G' G', these features are moreclearly shown in Figs. 6 to 9 and are constructed as follows: The bars FF are joined at their forward and rear ends by cross-rods F2 F3, whilethe bars F F are likewise connected by cross-rods F4 F5. The rods`F2 F3F4 F5 are shown as made of cylindric form and provided between theseveral bars F F and F' F' with tubular spacing sleeves or thimblesff.For convenience in construction the bars F and F are preferably made ofthe same width and arranged with their upper and lower edges in the sameplanes, and to avoid interference of the cross-rods F2 F3 FfF5 with eachother in the relative endwise movement of the two sets of bars the rodF5 is located above the level of the rod F2 and the adjacent forwardends of the bars F are cut away so that their upper edges extend beneaththe rod F5 is located at the level of the rod F2. The upper edges of thebars F F beneath said rod F5 are notched or cut away to clear said rodF5, and the rear ends of the bars F are cut away at their upper edges toclear the rod F3, as clearly seen in Fig. 6. The bars G G and G G aresimilarly connected at their forward and near ends by means of frontand' rear cross-rods G3 G4 and G5 G5. The rods G3 G5 are arranged in thesame manner as the rods F2 F5, but in the case of the rear ends of saidbars G G', as clearly seen in Fig. 7, the rod G is located below thelevel of the rod G5, while the bars G are cut away at their uppermargins to pass beneath the rod G5, and the rear ends of the bars G arecut away at their lower margins to pass over the rod G".

In the construction illustrated the upper and lower sets ofsupporting-bars F F and G G are given movement'by actuating deviceslocated at the sides and front of the furnace, and in order to afford astiff or rigid connection between the said actuating devices and theseveral bars constituting the four grids formed in one case by the barsF and rods F2 F5, in another case by the bars F and rods F" F5, inanother case by the bar G and rods G3 G4, and in still another case bythe bars G and rods G5 G5, devices are provided as follows: H H are twostiff or rigid metal beams shown as having the form of angleirons whichextend across the front ends of the bars F and F', and l l are two likebeams which extend across the front ends of the bars G G. The bars H H'are connected with the cross-rods F2 FL by means of rings or eyes h,which. encircle the thimbles f at points between the ends of' the bars FF and are provided with forward extensions or stems h', that extendforwardly through holes in the vertical flanges of the beams H H and areprovided on their ends with nuts which bear against the outer or forwardfaces IOO of the beams, as clearly seen in the detail j view, Fig. S.The beams I l' are connected, by means of like rings i i, with the rodsG3 G5, as indicated in Fig. 9. The said beams H H and I I are extendedpast the outermost bars F F G G of the grids at both sides of the grateand are attached at their ends to metal yoke-pieces J J and K K', whichform part of the actuating devices, by means of which endwisereciprocatory motion is given to the several sets of supporting-bars.The ends of said beams H H1 and l l' are shown as attached to the saidyoke-pieces by being inserted in the slots or sockets in the yokepiecesand secured therein by means of setscrews inserted in the yoke-piecesand bearing against the ends of the beams therein, as clearly seen inFig. 3. The cross-rods F2 F4 Aand G3 G5, which pass through the forwardends of the bars F F and G G', are preferably extend ed through theyoke-pieces J J and K rod F4, while atthe rear ends of the bars the K'and provided at their ends outside of the ITO said yoke-pieces withclamping-nuts, long thimbles f g being interposed between the outermostbars of the sets of bars F F and G G and the said yoke-pieces, so thatall of said parts may be rigidly clamped together by tightening the nutson the said rods. These features of construction are clearly vshown inthe detail view, Fig. 9, in connection with the forward ends of the barsF and G.

The four grids formed by the upper and lower sets of bars F F and G G orthe bars constituting' said grids may, so far as the general operationof the grate is concerned, be sustained or supported by any suitablesupporting means adapted to sustain them in position under the weight ofthe fuel on the grate, while permitting them to slide or move freely inan endwise direction. The drawings illustrate supporting devices forsaid bars, which are constructed as follows: Beneath the forward andrear portions of the lowermost sets of bars G and G and extendingtransversely of the furnace are two pairs of parallel beams L L. Betweenthe beams of each pair are arranged longitudinally-extending track-barsL' L', which correspond in number with and are arranged severallybeneath the said bars G and G, said trackbars L L having the form ofthin and wide vertically-arranged plates. Resting upon the upper marginsof said track-bars, between the same and the lower margins of the bars Gand G, are bearing-rollers Z Z, which are provided with peripheralgrooves adapted to receive the upper margins of the trackbars L L andthe lower edges of the bars G G. By reason of the grooved constructionof the supporting-rollers Z Z the same are held in engagement both withthe track-bars L L and with the bars G and G, While the rollers areadapted to move or roll freely on the adjacent margins of the saidtrack-bars and bars G G as the latter are moved endwise. rlhe upper setsof bars F and F are similarly supported at their forward and rear endsby means of two pairs of transverse beams M M, longitudinal track-bars MM, and rollers m m. The beams M M at the rear of the furnace are shownas supported by means of brackets Mzfrom a transverse girder N, whichextends across the furnace at the rear of the grate and forward of thebridgewall A. The beams M M at the forward ends of the grate are shownas being attached at their ends to the side plates C C of the hopper andas extending between the forwardends of the upper and lower sets ofsupporting-bars, it being of course understood, as seen in the planview, Fig. 2, and the face view, Fig. 4, that the yoke-pieces J J and KK, hereinbefore referred to, are located outside of said side plates, sothat the presence of the beams M M does not interfere with the movementof said yoke-pieces.

giving endwise reciprocatory motion to the four sets of supporting-barsF F and G G are alike in construction and are arranged in pairs at theforward end of the grate exterior to the side plates of the hopper withone of the devices of each pair at each side of the hopper, one pair ofactuating devices being adapted to operate the upper and lower bars Fand G, which support one of the two sets of grate-bars, while the otherpair acts upon the upper and lower bars F and G, which support the otherof said sets of vgrate-bars. All four of these devices are operatedbymeans of a single transverse horizontal rotative shaft O, whichextends across the front of the furnace above the forward ends of thesaid supporting-bars, said shaft, as shown, having bearings in the sideplates C C of the hopper in parts thereof which extend below and forwardof the front plate C2 of said hopper. The actuating devices for thesupporting-bars ciated cam-levers Q Q, located at opposite sides of thefeed-hopper, while the actuating devices for the bars F and G embracelike double cams R R and cam-levers S S, located inside of the cams P Pand cam-levers Q Q. The cams P and R are rigidly attached to the ends ofthe shaft O, which extend outside of the side plates C C, and thecam-levers Qand S at each side of the device are mounted on horizontalpivot or bearing studs W, that are rigidly attached to the said sideplates CC and extend outwardly therefrom. The cam-levers Q and S haveopen frames S2, which surround the cams and are provided with dependingrigid arms Q and S, which extend downwardly to the level of the lowersets of bars G and G. The arms Q of the levers Q are connected at theirlower ends with the yokepieces K by means of links Q3,while the arms Sof the cam-levers S are connected at their lower ends with theyoke-pieces K by means of links S3, Fig. 3. Connections are made betweenthe links Q3 and S3 and the yoke-pieces K and K, adapted to afford lostmotion between said yoke-pieces and the cam-levers, consisting of blocksZcZc,which slide horizontally in guide-slots in the said yoke-pieces Kand K and to which the said links Q3 and S3 are pivoted. The upperyoke-pieces J J which are connected with the upper sets ofsupporting-bars F and F, are actuated through the medium of the loweryoke-pieces K and K, which latter are provided with upwardly-extendingrigid arms K2 K3, connected at their upper ends with the upperyoke-pieces J J by means affording lost motion between said parts,consisting of blocks y' j', which slide in horizontal guide-slots in thesaid upper yokepieces J and J and to which the upper ends of said armsK2 K3 are connected, preferably by means of pivot pins or studs, Fig. 3.If l the Vamount of relative movement or lost The devices hereinbeforereferred to forA F and G consist of double cams P P and asso- IOO TIO

guide-slots of said yoke-pieces.

motion afforded by the sliding of the blocks 7c and j j in theyoke-pieces K K and J J be invariable or constant, the extent of boththe endwise or longitudinal movement and of the rocking movement in thegrate-bars will remain the same. To provide for variation in suchendwise and rocking movements of the grate-bars, T have, however,provided means sliding movement of said blocks in the yokepieces, asfollows:y T T are adjustable stopblocks mounted on the upper yoke-piecesJ J and adapted for contact therewith of the blocks j j in the rearwardmovement of said blocks relative to the yoke-pieces, said stopblocks T Tbeing arranged to slide in the guide-slots in which said blocks j j aremounted. U Uy are like stop-blocks mounted in the lower yoke-pieces K Kand adapted to limit the rearward movement of the sliding blocks 7e k insaid yoke-pieces, said stop-blocks U U being also mounted in the Toprovide for adjustment of said stop-blocks T T on the upper yoke-piecesJ J, horizontally-arranged screw-shafts T2 T3 are mounted in the forwardends of manner that they are held from endwise movement in saidyoke-piece, said screwshafts extending through holes formed in thesliding blocks 7c c, but having screw-threaded engagement with thestop-blocks T T. Said screw-shafts T2 T3 are provided at their forwardends with beveled gear-pinions t t', adapted to engage beveledgear-wheels t2 t2, attached to operating-shafts T t T5, which extendacross the front of the grate and are mounted in bearing-brackets t* t5,which are attached to the forward ends of `the said yoke-pieces J and J.Said shafts T4 T 5 are provided at their ends with hand-wheels t t7, bywhich the same maybe turned to effect the shifting of the stop-blocks TT. The lower yoke-pieces K K are similarly provided with adjusting meansfor the stopblocks U U', embracing screw-shafts U2 U2, which are mountedto rotate in the yokepieces K and K, pass through apertures in theblocks 7c le and have screw-threaded engagement with the stop-blocks UU. Said screy r-shafts U2 U3 are provided at their forward ends withgear-pinions u u', which intermesh with beveled gear-wheels u2 fuj,attached to operating-shafts U4 U5, mounted in bearing-brackets fw* a5upon the yoke-pieces K K. The shafts U4 U5 are provided at their endswith hand-wheels u 11,7, by which the same may be turned to effect theadjustment of the stop-blocks U U.

The actuating-cams P and R each have two bearing-surfaces p p r rarranged side by side. The frame Q2 of the cam-lever Q is provided withlower and upper arms or members q and q', which extend below and abovethe cam R and are arranged in offset for varying the extent of' theyoke-pieces J J in suchrelation vto each other in the planes of the twocam surfaces p p', the lower part q having an upwardly-facingbearing-surface adapted to engage the cam-surface p and the upper partq. having a downwardly-facing bearing-surface adapted to engage thecamsurface p. The frame S2 of the cam-lever S likewise has a lower parts, provided with an upwardly-facing bearing-surface adapted to engagethe cam-surface 1, and an upper part s having a downwardly-facingcam-surface adapted to engage the cam-surface r', the two cam-faces ofthe double cam in each case acting on the upwardly and downwardly facingsurfaces of the said frame to give proporly-timed oscillatory movementto the camlevers for moving or shifting endwise the upper and lower setsof supporting-bars F and G or F and G actuated thereby, as required forgiving endwise reciprocatory and rocking movement to the grate-bars Theoperation of the grate-actuating devices may be better understood byreferences to Figs. 10, l1, 12, and 13, which show the differentpositions assumed by the gratebars in their endwise and rocking movementand the corresponding positions occupied by the supporting-bars,cam-levers, and cams, said figures illustrating the actuating devicesfor one pair only of upper and lower supporting-bars and showing one oftheir innermost cams R and cam-levers S and the supporting-bars F andG', actuated thereby. Fig. 10 illustrates the parts when the gratebarsof the row carried by the supportingbars F and G are in their horizontalor depressed position and at the forward limit of their endwisereciprocatory movement, said bars F and G being at this time in theirforward or advanced position, while the supporting-arms E of thegrate-bars are rearwardly inclined from their pivots and the links E2are also rearwardly inclined and substantially parallel with said armsE. At this time the part of the cam-surface r which is at the greatestradial distance from its center is acting on the upper part s of thecam-lever frame S2 to hold the arm S of the cam-lever S at theforwardlimit ofA its movement, while the advance end of a concentricpart of the cam-surface r nearest the center of the cam has just come incontact with the lower part s of said frame. Moreover, the blocks k jare at this time at the forward limit of their movement in theyokepieces J and K, and in the turning of the cam R in the direction ofthe arrow from the position shown in Fig. l0 no movement of thecam-lever takes place until the cam has made part of a revolution, whena projecting part of the cam-surface r which is at the greatest distancefrom'the center of the cam reaches and acts upon thelower part s of thecam-lever frame S2 in such manner as lto swing the lower end of the armS rearwardly,

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thereby carrying the lower yoke-piece K rearwardly without acorresponding movement of the upper yoke-piece J until the block j,which has considerable lost motion or movement relative to the upperyoke-piece strikes the stop-block T on said upper yoke-piece, afterwhich the upper supporting-bar F is moved rearwardly with the lower barG. The effect of such shifting rearwardly of the lower bar G is to movethe pivots of the links E2 rearwardly relatively to the pivots of thesupporting-arms E of the grate-bars, with the effect that the gratebarsare tilted or rocked upwardly and forwardly, so as to lift their rearends above the general level of the top of the grate without any upwardmovement of the forward ends of said grate-bars. Fig. 11 illustrates theposition of the parts at the time the block y" strikes the stop-block Tlon the upper yokepiece J the projection of the cam-surface r being nowin contact with the lower part s of the cam-lever and in the act ofdepressing the same, and the rearward movement of the lower bar Grelative to the upper bar F having been completed the gratebars havebeen lifted or tilted forward to their position of greatest elevation.Fig. l2 shows the next step in the movement of the parts, which is theshifting of both bars F and G rearwardly to give rearward endwisemovement to the elevated grate-bars. In the turning of the cam from theposition shown in Fig. 1l to the position shown in Fig. l2 theprojecting part of the cam-surface r will throw the lower end of thecam-lever to the rearward limit of its movement, with the effect ofmoving or shifting both of the bars F and G rearwardly from the positionshown in Fig. 11, the upper bar F being carried rearwardly by the actionof the block y" on the stop-block T, with which it is at this time incontact. During this movement of the two bars F and G, the pivots of thesupporting-arms E and the links E2 are maintained in the same relativepositions, so that the grate-bar is retained in its elevated position,but is moved bodily rearward without any change in its angle orinclination. Further turning of the cam R from the position shown inFig. 12 carries the projection of the cam-surface r away from the lowerpart s of the cam-lever frame, while an outwardlydeflected part of thecam-surface r acts on the upper part s of the said cam-lever frame toswing the lower end of the cam-lever forwardly, thereby moving forwardthe lower yoke-piece K until the block 7" reaches the forward limit ofits movement on the upper yoke-piece J, as seen in Fig. 13. Thisforwardmovement of the lower supporting-bar G without any correspondingmovement of the upper supporting-bar F has the effect of carryingforward the lower pivots of the links E2 and rocking or tiltingrearwardly the grate-bars E until their upper edges resume a horizontalposition. The grate-bars supported by said bars F G have now reachedtheir depressed or horizontal positions but are at the rearward limit oftheir longitudinal movement. This is the position illustrated in said Fig.V 13. Further turning of the cam R from the position shown in Fig. 13has the effect, through the further action of said outwardly-deflectedpart of the cam-surface 1 on the upper part s of the cam-lever frame, ofthrowing the arm S of the cam-lever still further forward, therebymoving forward the lower yoke K and with it the upper yoke J and givingcorresponding simultaneous forward movement to both of the bars F and G,with the result that the grate-bars carried thereby are moved forwardwithout any rocking or tilting movement until the parts reach theiroriginal positions. (Shown in Fig. 10.)

As illustrated in said Figs. l() to 13, the stop-block Uof the loweryoke-piece vK is located as near the forward end of the slot in saidyoke-piece K as its capacity for adjustment permits and is therefore insuch position as to give practically no lost motion between the slidingblock 7f3 and said yoke-piece K, with the result that said yoke-piece Kand the bars G partake of the entire movement of the lower end of thecam-lever arm S', and the greatest possible endwise movement is given tothe bars F and G and the several grate-bars carried thereby, andconsequent maximum rate of feed or rearward movement in the layer offuel is produced. If, however, the stop-block U be adjusted rearwardly,so as to give a greater or less extent of lost motion between thesliding block 7c and the yoke-piece K, then in each rotation of the camR while the cam-lever will make its full oscillation or stroke theyoke-piece K will be moved through a distanceless than the maximumstroke or movement of the supporting-bars, andthe grate-bars carried bysuch supporting-bars will have a shorter stroke with correspondingreduction in the extent in-which the layer of fuel is moved rearwardlyin each rearward movement of the elevated grate-bars. Moreover, byshifting or changing the position of the stop-block T in the upperyoke-piece J the block will move a shorter distance from its forwardposition, as shown in Fig. l0, before it strikes the said stop-block T,and the rearward movement of the lower supporting-bar G with respect tothe upper bar F will be correspondingly less, so that the grate-barsconnected therewith will be moved or tilted upwardly a distance lessthan the full extent of their capacity for tilting movement, and thelayer of fuel will be to a less extent disturbed or agitated than willbe the case when the grate-bars are given their full rocking stroke ormovement.

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lt has heretofore been stated that the upper and lower sets ofsupporting-bars F and G and the rows of grate-bars supported thereonwill be moved in alternation with the intermediate sets of bars F and Gand the rows of grate-bars supported upon the latter, and the operationof the actuating devices for one of the upper sets and the correspondinglower set of supporting-bars, with their associated rows of grate-bars,having been described it may now be added that the two pairs of cams P Pand R R are set upon the shaft O in reverse positions with respect toeach other, so that the set of upper and associated sets of lowersupporting-bars and the rows of grate-bars severallyT supported therebyare moved alternately or successively, the grate-bars in one set beinglifted and moved backwardly during the time that those of the other setare in their depressed position. The general effect of the operationldescribed is that the grate-bars, which are tilted upwardly, andthereby caused to pene trate the layer of fuel above them, in theirrearward movement carry with them the layer of fuel, which slides overthe top surfaces of the intermediate depressed bars.

Vhile the timing of the movements of the grate-bars, resulting from theparticular shape of the cams illustrated, is a desirable one, yet inpractice the same may be changed or modified by changing the shape ofthe cams, so as to give different timing, it being manifest thatprovided the movements of the grate-bars take place in the orderdescribed such movements may take place either simultaneously orsuccessively or in part simultaneously and in part successively, as maybe found desirable in practice-that is to say, it is only essential thatone set of grate-bars should rise and move rearwardly when the other setembracing the alternate rows of bars are depressed to afford smoothsurfaces over which the fuel carried rearwardly with the elevated barsmay move or slide and the timing of the supporting grate-bars either beadjusted in such manner that the depressed bars will move forward whilethe elevated grate-bars are moving rearwardly or so that the depressedgrate-bars remain stationary while the said elevated grate-bars aremoving rearwardly. It is to be understood, however, that in order toprevent liability of overheating the rear ends of the grate-bars, whichare thrown upwardly intothe mass of burning fuel when the bars areelevated, it is desirable that the period during which the bars areelevated and are moving backwardly should be as short as possible, andin the case illustrated the camsare so shaped that the elevation,rearward movement, and depression of the bars is quickly accomplished,while the said bars have periods of rest when in their depressedpositions or after they are depressed and before they are elevated.

The provision for adjustment of the extent of endwise movement of thegrate-bars, together with the extent of rocking or tilting movementthereof, enables the rate of feed of the fuel to be varied and alsoenables the eX- tent to which the bars are thrown upwardly into the fuelto be changed, so that by the use of the adjusting devices the operationof the grate may be changed to correspondwith the conditions requiredfor different kinds of fuel-as, for instance, according to whether thefuel burns rapidly or slowly and whether or not it is liable to cake orcoke, and a greater or less rocking movement of the grate-bars isrequired to break up or agitate the same.

In addition to the features above set forth I have provided means bywhich the several grate-bars may be removed or detached for a renewal orrepairs without disturbing the operative parts of the grate mechanism.For this purpose I have made the grate-bars detachable from thesupporting arms E thereof by sliding or endwise movement of the barswith respect to the said arms and have provided for adjustment of theactuating devices, so that all of the bars may be tilted or rockedupwardly and forwardly a distance greater than in their usual or normalrocking movement, and so as to bring the lower margins of the rear endsof the bars above the front ends of the adjacent bars, and thus permitany bar to be disengaged from its supporting-arm.

Means affording detachable connection of the bars E with the arms E isprovided, as shown in Figs. l5 to 18, as follows: The lug e, to. whichthe link E2 is pivoted, as before stated, is made integral with theupper end of the supporting-arm E and has the form of a rearwardextension of the upper end of said arm, and on the upper margin of thearm and lug is formed a dovetailed rib e. The grate-bar E is provided onits under surface with a longitudinal groove e, of dovetail form,adapted to receive said rib e. Said groove e2 is closed at its rear end,or that adjacent to the rear end of the bar E, by means of a transversewall or stop projection e, Fig. l5; but the said groove is open at theforward end of the grate-bar. As a result of this construction thegrate-bars can be engaged with the arms E by sliding them forward on theribs e and disengaged from said arms by drawing them rearwardly fromsaid ribs. If, therefore, the grate-bars be tilted forwardly andupwardly far enough to bring their rear ends above the front ends of adjacent bars, the said bars thus detachably connected with the arms E maybe severally drawn rearwardly and disengaged from said arms. Theactuating devices illustrated are adapted for throwing the grate-barsupwardly and forwardly into the position described, as will behereinafter set forth.

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The rear ends or edges of the grate-bars are so shaped or curved that aseach bar swings upwardly its said rear edge will remain at a uniformdistance from the front end of the adjacent bar at the rear of it, sothat no spaces large enough for the entrance of pieces of coal orclinkers will be left between the ends of thelifted bars. Inasmuch asthe bars are made of such depth or width at their rear ends that whenrocked forwardly their rear edges will extend below the top surfaces ofthe front ends of adjacent bars, as hereinbefore stated, in the usualposition of the parts all of said bars will be locked from rearwardmovement on the arms E by the presence of the front ends of adjacentbars at the rear of them, and none of the bars can be removed ordisengaged from the arms E except by an unusual movement of the bars, bywhich their rear ends are brought above such. forward ends of the barsat the rear of them. Such unusual position of the bars required topermit the removal thereof is called the repair position, and the barsare brought into this position, as shown in Fig. 14, by 'giving endwisemovement to the lower with respect to the upper sets of supporting-barsF F and G G greater than is required for tilting or rocking thegrate-bars in the usual operation of the grate. This is effected. byadjustment of the stop-blocks T T inwardly or rearwardly far enough togive such an extent of lost motion between the upper yokepiece J and theupper yoke-piece K as to produce the desired result. As shown in Fig.14, the dotted lines indicate the position of the parts when thegrate-bars are elevated preparatory to their rearward movement in theusual operation of the grate, while the full lines show the positionparts when the stop-blocks T are especially adjusted inward to bring thegrate-bars into the repair position, the supporting-bar G at this timebeing moved so far inwardly with respect to the supporting-bar F as tolift the rear ends of the grate-bars above the general level of the topof the grate.

In order to insure that all of the grate-bars shall be brought,4 whendepressed, into position with their upper surfaces in the same plane, Iso shape the lugs e that they will come in contact with the adjacent topsurface of the bars F F below them when the said grate-bars are tiltedrearwardly or depressed, as clearly seen in Fig. 15.

It will of course be understood that the grate-bars E will be spaced atsuch distance apart laterally or provided with spaces between them ofsufficient area to afford a suitable supply of air to the layer of fuelresting on the grate. Said grate-bars may, however, be made of suchwidth as to leave relatively narrow spaces between them and notched or'grooved at their side faces to provide for a assumed by the suitableair-supply. A construcl tion of this kind is shown in the detail views,Figs. 15 to 18, the bars being made of rectangular shape, as seen inplan view, and so wide as to leave only a slight space between the barsof adjacent rows, while the side faces of the bars are provided withvertical grooves or notches e4 c4, affording channels or passages forthe upward passage of air between the said bars.

As a further improvement in mechanicalstoking grates of the generalcharacter hereinbefore described I have provided a construction at therear end of the grate as follows: The'girder N, which extends across therear end of the grate, as hereinbefore stated,

serves as a support for a transversely-extending row of fire-brick ortile V, which project forwardly from the said girder so as to overhangthe rear end of the grate. The grate is, moreover, provided at its rearend with auxiliary grate-bars E3 E3, 'which are rigidly attached to theupper supporting-bars F and F and are made of the same width as thegrate-bars E E and are arranged in alinement therewith with their uppersurfaces in the same plane with the top surfaces of said grate-bars E Ewhen the latter are depressed. The bars E3 E3 being attached to theupper series of supporting-bars F F, they move with the latter in theirendwise reciprocatory movements. Said blocks E3 E3 extend beneath theoverhanging front edges of the nre-brick or tiles V. .The said auxiliarygrate-bars E3 E3 are shown as attached to the rear ends of the bars Fand F by means of downwardly-extending rigid shanks on the rear ends ofthe bars,.which are slotted to receive, and are riveted to, the rearends of said bars. bars E3 E3 are located nearly in contact with thelower surfaces of the overhanging firebrick V, so that close joints,preventing the passage of ashes between said parts, will be maintainedbetween theupper surfaces of said auxiliary bars and said fire-brick.Said.

fire-brick are preferably beveled-or rounded at their forward and uppersurfaces, so as to present an inclined or rounded surface over which theashes and clinkers and the burned-out fuel will pass when the same arecarried against the forward edges of the fire-brick in the rearwardmovement of the layer of fuel on the grate. lThe girder N is located farenough forward from the front surface of the bridge-wall A to afford aver- The upper surfaces of the auxiliary IOO tical space or openingthrough which ashes discharged from the grate over the firebrick V mayfall into the ash-pit. To protect the rear or inner face of the girderN, which is preferably made with a central web and top and bottomhorizontal flanges, a lining N of :lire-brick is preferably applied tothe inner surface of said girder, the same resting on the lowerhorizontal flange thereof. The row of fire brick V, extending ISO acrossthe rear end of the grate and rising grate-bars arranged side by sideand means slightly above the same, forms a ridge or for giving rockingand bodily reciprocatory ledge which obstructs or retards the rearmotionto the grate-bars of each row of grate- Ward movement of the layer ofashes as the i bars adapted to elevate and move rearwardly 5. sameapproaches the rear end of the grate, the grate-bars of one row duringthe time the 7o so as to crowd together, concentrate7 or grate-bars ofthe other row are depressed. render more compact said layer, and thusre- 2. A grate embracing a set of rocking and strict the passage of airthrough the burnedl endwise-movable grate-bars, the rear ends of out ornearly burned-out portion of the layer which are adapted to rise andfall in the rockio of fuel resting on the rear part of said grate. ingmovement thereof, and means for giving 7 5 In the operation of grates ofthis kind it is of rocking and endwise-reciprocatory motion to courseintended that the rearward feed of saidgrate-bars adapted to shift thesaid bars the layer of fuel on the grate should be at rearwardly whentheir rear ends are elevated such rate that the combustion of fuel inthe i and to move them forwardly when their rear I layer will becompleted at the time the fuel ends are depressed. 80 reaches the rearend of the grate, because if 3. A grate embracing a set of rocking andthe combustion be not completed at such endwise-movable Grate-bars, therear endsof time a part of the fuel will pass from the which rise andfall in the rocking movement rear end of the grate in an unconsumedthereof and which are arranged in parallel 2o state, while if thecombustion be comrows with the bars of each row in end-to-end 8 5 pletedbefore the fuel reaches the rear end of relation, and means for givingboth rocking the grate the entire grate-surface will not be x andreciprocatory motion to said grate-bars utilized for heating purposes.An effort adapted toshift the said grate-bars rearwill usually be madeto so adjust the rate of wardly when their rear ends are elevated andfeed or rearward movement of the layer of to move them forwardly whensaid rear ends 9o fuel that all of the fuel will be burned just aredepressed. before the rear end vof the grate is reached; 4. A grateembracing two sets of gratebutin such case a comparatively thin layerbars, the grate-bars in each set being arof burned-out fuel or asheswill be present on ranged in parallel rows with the grate-bars of 3o therear end portion of the grate, through i each row in end-to-endrelation, the rows of 95 which air is likely to pass with greaterfreebars of one set being arranged in alternation dom than through theunconsumed portion with the rows of bars of the other set, and of thelayer of fuel, with the result oflessenmeans for giving rocking andbodily reci roing the draft through such unconsumed catory motion tosaid bars, adapted to e 'ect 3 5 portion. Vhen the ridge formed by thethe shifting of the bars of each set rearwardly roo row of fire-brick VV is present, however7 when their rear ends are elevated and when therearward movement of the ashes will be the rear ends of the bars of theother set are retarded and the same will be pressed or depressed. forcedagainst the front of the said ridge, 5. A grate embracing a set ofgrate-bars 4o with the result that the layer will at this which areseverally mounted to swing or rock 105 point be compressed andthickened, so as to on pivots located below the forward ends of nearlyor entirely prevent the passage of air the same so as to rise and fallat their rear therethrough, thereby insuring the passage ends, and meansfor giving rocking and endof practically all of the air through theporwise-reciprocatory motion to said bars.

4 5 tions of the layer of fuel in which combus- 6. A grate embracing arow of grate-bars 11o tion is taking place. arranged end to end, each ofsaid bars being Provision is made to prevent passage of mounted to rockor tilt on an axis located beair upwardly through the passage betweenlow its forward end and to rise and fall at its the girder N and thebridge-wall, consisting rear end, said bars being made of greater in theinstance illustrated of a girder N2, exdepth at their rear ends than thevertical 115 tending across the ash-pit below the grate at throw of suchrear ends, and means for giving some distance forward of the girder N, aboth rocking and endwise-reciprocatory moplate N3, extending from thelower edge of tion to said ars. said girder downwardly to the top of'the7. A grate embracing a row of grate-bars girder N2, and a closing-plateor damper N4., i arranged end to end, each of said bars being izo whichis hinged at its upper edge to the girder mounted to rock or tilt on anaxis located be- N2 and Iwhich when it hangs vertically low its forwardend and to rise and fall at its reaches to the bottom of the ashepit.rlhe rear end, said bars being curved at their rear space between thebridgewall Al and the ends, and means for giving both rocking an 6oplates N3 N4 constitute a receptacle in which endwise-reciprocatorymotion to said bars, I2 5 the ashes accumulate as they fall, the late 8.A grate comprising a row of grate-bars, NL being adapted to be swungupward y or two endwise-movable supportingbars,means opened to permitthe removal of such ashes. operated by the relative endwise movement Iclaim as my inventionof said supporting-bars for giving rocking 4 1. Agrate embracing at least two rows of movement to said grate-bars, andmeans for 13o giving endwise-reciprocatory motion to saidsupporting-bars-adapted to give greater eX- to the other.

V two supporting-bars, depending rigid arms 1' their upper ends to theseveral grate-barsand Io v reciprocatory motion tosaidsupporting-barsand u the-other bar. I I

j an kupper and a lower supporting-bar located `vinvvertica'l alinement,a depending rigid arm oneach y* porting-bar7 two linkspivoted at theirupper j. 32o

-tothe i tend at opposite "l porting-bar, and actuatingendwise-.movement eral grate-bars arepivoted, links pivoted attheir'upperends to theseveral grate-bars and atv their lower endsvaffords lost motion 'v ends with the grate-bars at vciprocatory`inotion to Vone of the support-ingsaid grate-bars being `pivoted to oneof said Iat their lower ends with the other support- -cam-lever, and a114. A grate-embracing two sets of rockingandendwise-movable.grate-bars, the bars of eachset being arranged inparallel rows with the rows of one set in alternation-with those 'ofthe-other set, two sets of upper and twosetsof lower endwise relativelymovable supportingbars, connections between said supportingbars and thegrate-bars bywhich the grate-bars are rocked through relative endwisemovenient of the upper and lower setsoi supporting-bars, means rigidlyconnecting with each other at their ends the supporting-barsconstituting each set to form grids, and means acting on thesaid'gri'dsto give endwise-reciprocatory movement tosaidv upper andlower sets ofsupporting-bars.

l5. A grate embracing two sets ofrocking and endwise-movablegrate-bars,the bars of eachsetbeing'arranged in parallel rows with the rows ofone=set in alternation with those of the other set, two sets of upperand two tent of movement 'to-one supporting-bar than 9. A gratecomprising a row of grate-bars,

on the several grate-bars pivoted to one of the said supporting-bars,links pivoted at at their lower ends tothe other of said sup'-porting-bars, and means for giving endwise- `for moving one of saidbarsrelative to l 0. A grate comprising fa row of grate-b ars,

grate-barpivoted tothe upper supends't'ofeach grate-bar and at theirlower ends lower. supporting-bar and which eX- sides of the said uppersupmeans for giving to said supporting-bars.

1'1. Agratecomprising arow of grate-bars, two supporting-bars, to one ofwhichthe sevporting-bars, said grate-bars being pivotal connected Vwiththe bars of the uppersets of supporting-bars, links connectingv saidgratebars with the bars of the'lower sets of supporting-bars, meansrigidly connecting with each other the supporting-bars constituting eachset to form gridsI and means acting on the said grids to giveendWise-reciprocatory movement to said upper and lower sets ofsupporting-bars.

16. A grate comprising a row Vof rocking and endwise-movable grate-bars,two supporting-bars with one of which said gratebars are pivotallyconnect'edflinkszpivotedat their upper ends to the severalgrate-bars andat their lower endsto the other supportingbar, connections between saidysupportingbars by which one-of said bars is moved by the other bar,affording lost motionbetween said bars, means for varying the extent oflost motion between said supporting-barsJ `actuating means for givingendwise :movement to one y.of said supporting-bars, and connectionsbetween said actuating means and the supporting-bar operated thereby,atording lost motion betweensaid actuating means and' said bar, andmeans for varying the eX- tent of lost motion between said actuatingmeans and the said bar.

177. A grate comprising a row of rocking and endwise-movable grate-bars,upper and lo'wer supporting-bars, the said grate-bars being pivotedlinks ypivotedvat their upper ends `tothe gratebars and their lower endsto the lower supporting-bar, connections between the saidsupporting-bars by which the lupper bar is actuated by the lower bar,affording lost motion` between the-bars, means for varying the eX-tentof lost `motion between the bars, and -means vacting on thelowersupporting-bar for giving endwise movement to the same.

18. A grate comprising a row of rocking to the other of said suporting-barsconnecting means between t e saidv supporting-bars bywhichone of said bars is moved by the other bar and which between thesaid bars, and actuating means for giving endwise-rebars.

1'2. A grate embracing a rowl'of rocking and endwise-movable grate-bars,upper and lower supporting-bars located beneath said grate-bars,A saidgrate-bars being pivotedv at theirforward ends t'o-the -uppersupportingbar, linkspivotally'connected at their upper points rearwardof the iront ends of the latter, and at their lower ends with the lowersupporting-bar, connections betweensaid'sup orting-barszby which theupper supportingar is actuated romthe lower supporting-bar,constructedtov afl-ord lost motion between said supportingbars, andmeans acting on the lower bar to give -endwise-re'ciprocatory motionthereto.

153. A grate embracing a row of rocking and endwise-movable grate-bars7two supporting-bars located beneath said grate-bars,

supporting-bars, links pivotally connected at their upper ends withthegrate-bars and ing-bar, connections by which the uppersupporting-baris actuated from the lower bar constructed to afford lost motion betweensaid supporting-bars, and means acting on thelower bar to giveendwise-reciprocatory motion thereto, embracing an oscillatingrotat-ivecamactingthereon.

to the uppersupporting-bar,

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and endwise-movable grate-bars, upper and lower supporting-bars locatedbeneath said grate-bars, said grate-bars being pivoted to the uppersupporting-bar, links pivoted at their upper ends to the grate-bars andat their lower ends to the lower supportingbar, connections between saidsupportingbars by which the upper bar is actuated from the lower bar,aliording lost motion between saidbars, means for varying the extent oflost motionbetween the bars, actuating means Jfor giving endwisemovement to the lower bar and connectionsbetween said actuating meansand the said lower bar affording lost motion between said actuatingmeans and said lower bar, and means Jfor varying the extent of lostmotion between said actuating means and said lower bar. l

19. A grate comprising a set of rocking and endwise-movable grate-bars,a set of upper and a set of lower endwise relatively movablesupporting-bars, the supporting-bars constituting each set being rigid yconnected with each other to form a grid, means operated by the relativeendwise movement of said upper and lower sets of supporting-bars forgiving rocking movement to said @frate-v bars, pairs of associated upperand ower yoke-pieces, the upper yoke-piece of each pair being attachedto the upper grid and the lower yoke-piece of `each pair being attachedto the lower grid, and the upper yoke-pieces having limited movementwith respect to the lower yoke-pieces to afford lost motion between saidgrids, actuating means connected with the lower yoke-pieces to giveendwisereciprocatory motion to the same, and an adjustable stop upon oneof the yoke-pieces of each pair of associated yoke-pieces adapted forcontact with the other yoke-piece of the pair for varying the extent oflost motion between said upper and lower grids.

20. A grate com rising a set of rocking and endwise-movab e grate-bars,a set of upper and a set of lower endwise relatively movablesupporting-bars, the supporting-bars constituting eadli set beingrigidly connected with each other to form a grid, means operated by therelative endwise movement of said upper and lower sets ofsupporting-bars for giving rocking movement to said gratebars, pairs ofassociated upper and lower yoke-pieces, the upper and lower yoke-piecesof each pair being attached respectively to said upper and lower gridsand having limited longitudinal movement with respect to each other toafford lost motion between said grids, actuating means connected withthe lower yoke-pieces of each pair to give endwise-reciprocatory motionto the same, an adjustable stop upon one of the yoke-pieces of each pairof associated upper and lower yokepieces for varying the extent of lostmotion between said upper and lower grids, sliding connections betweensaid actuating means and the lower yoke-pieces, affording lost motionbetween said actuatinfr means and said yoke-pieces, and adjustab e stopson said lower yoke-pieces for varying the extent of such lost motionbetween the same and said actuating means. A

21. The combination with a set of rocking and endwise-movablegrate-bars, a set of uper and a set of lower endwise relatively movablesupporting-bars, the supporting-bars in each set being rigidly connectedwith each other to form a grid, means operated by the relative endwisemovement of the upper and lower grids for giving rocking movement tosaid grate -bars, airs of associated upper and lower yoke-pieces theupper yoke-piece of each pair being attached to the upper grid and thelower yoke-piece of each pair being attached to the lower grid, asliding stop on one of the yoke-pieces of each pair, limiting themovement of said -yoke-pieces relatively to each other, and ascrew-shaft mounted on the yoke-piece provided with said adjustable stopadapted to engage and move the latter. 22. The combination with two setsof rocking and endwise-movable grate-bars, of two sets of upper and twosets of lower endwise relatively movable supporting-bars, thesupporting-bars of each set of such bars being rigidly connected witheach other to form grids, means operated by the relative endwisemovement of the upper and lower sets of supporting-bars for givingrocking movement to said grate-bars, pairs ol' associated yoke-pieces,the upper yoke-piece of each pair being attached to one of the uppergrids and the lower yoke-piece of each pair being attached to one of thelower grids, said yokepieces on the upper grids having limitedlongitudinal movement with respect to those on tthe lower grids aordinglost motion between said upper and lower grids, an adjustable stop onone of each pair of associated upper an lower yoke-pieces for varyingthe extent of lost motion between the upper and lower grids, andactuating means embracing a roytative shaft, cams on said shaft andassociated cam-levers connected with one of the -yoke-pieces of eachpair.

23. The combination with two sets of rocking and endwise-movablegrate-bars, of two sets of upper and two sets of lower endwiserelatively movable supporting-bars, the supporting bars of each set ofsuch bars being rigidly connected with each other to form a grid, meansoperated by the relative endwise movement of the upper and lower sets ofsupporting-bars for giving rocking movement to said grate-bars, pairs ofassociated yokepieces, the upper yoke-piece of eachpair being attachedto one of the upper grids and the lower yoke-piece of eachpair beingattached to one of the lower grids, said yoke-pieces on IOC TIO

v upper and the lthe upper grids having limited longitudinal movementwith respect to those on the lower grids affording lost motion betweensaid upper and lower girds, an adjustable stop on one of each pair ofupper and lower yoke-pieces for varying-the extent of lost motionbetween the upper and lower grids, actuating means connected with oneofthe yoke-pieces of eachupper and lower pair, screw-shafts mounted onthe yoke-pieces carrying said adjustable stops and having screw-threadedengagement with said stops, and a transverse shaft mounted on theyoke-pieces carrying said stops and connected by gearing with saidscrew-shafts.

` 24. The combination with a set of rocking and endwise-movablegrate-bars, of two sets of upper and two sets of lower endwiserelatively movable supporting-bars, the bars of each set being rigidlyconnected with each other to form a grid, pairs of associated upper andlower yoke-pieces, the upper yokepiece of each pair being attached tothe upper grid, and the lower yoke-piece of each pair being attached tothe lower grid, sliding blocks on the upper yoke-pieces which areconnected with and move with the lower yokepieces, adjustablestop-blocks on the upper yoke-pieces for limiting the movement of saidsliding blocks thereon, screw-shafts mounted on said upper yoke-piecesand engaging said stop-blocks for adjusting the position of the same,sliding blocks mounted on the lower yoke-pieces of each pair, actuatingmeans connected with :said sliding blocks on the lower yoke-pieces,stop-blocks on said lower yoke-pieces for limiting the movement of saidsliding blocks with respect thereto, screw-shafts mounted on said loweryoke-pieces for adjusting said stop-blocks, and actuating-shafts mountedone on the other on the lower yoke-pieces and connected by gearing withsaid screwshafts.

25. The combination with a row of rocking and endwise-movablegrate-bars, of two supporting-bars located vertically beneath the same,depending rigid arms on the several grate-bars which are pivoted to theupper supporting-bar, links pivoted at their uper ends to the severalgrate-bars and at their lbwer ends to the lower supporting-bar, upperand lower yoke-pieces connected and moving with said upper and lowersupporting-bars respectively, a sliding block on the upper yoke-piece,which is connected and moves with the lower has limited longitudinalmovement upper yoke-piece to afford lost motion between saidyoke-pieces, an adjustable stop on the upper yoke-piece for varying theextent I of lost motion between the said upper and lower yoke-pieces, `asliding block on the lower yoke-piece, actuating means connected y barsand at their lower ends with said sliding block, and an adjustable stopon the lower yoke-piece affording a variable extent of lost motionbetween the actuating devices and said lower yoke-piece.

26. A grate comprisinga row of grate-bars, upper and lowersupporting-bars, depending rigid arms on the oted at their lower ends tothe upper supporting-bar, and links pivoted, at their upper ends to theseveral grate-bars and at their lower ends to the lower supporting-bar,said arms having at their upper ends lateral extensions or lugs to whichthe said links are pivoted and being detachably connected at said upperends with the said grate-bars.

27. A grate comprising a row of rocking andendwise-movable grate-bars,upper and lower supporting-bars, depending rigid arms on the severalgrate-bars to the upper supporting-bar, and links pivoted at their upperends to the several grateto the lower supporting-bar, said arms on thegrate-bars having lateral extensions or lugs to` which the said linksare pivoted and being detachably connected with the said grate-bars bymeans of dovetail connections permitting separation of said parts bylongitudinal movement of the bars relative to the said-` arms.

28. A grate comprising a set of rocking and endwise-movable grate-bars,upper and lower supporting-bars, depending rigid arms on the grate-barswhich are pivoted at their lower ends to the upper supporting-bars,links pivoted at theirupper ends to the grate-bars and at their lowerends to the lowerfsupporting-bars, said arms on the grate-bars ha vinglateral extensions or lugs to which the said links are pivoted and beingdetachably connected with the said grate-bars by means of interlockingconnections permitting separation of said parts by longitudinal movementof the grate-bars relative to the said arms, and means` for givingendwisel movement to the upper and lower supporting-bars embracingadjusting means adapted for bringing said supporting-bars into suchrelative position that the rear ends ofthe grate-bars are lifted abovethe forward ends of adjacent bars to permit the removal of saidgrate-bars from the said arms. v

29. The combination with a grate embracing grate-bars which have rockingand endwise-reciprocatory motion to effect the rearward movement of fuelon the grate of a ridge or ledge of refractory material overhanging therear end of the grate and adapted for the passage thereover of the ashesor burned-out portions of the fuel.

30. The combination with a grate embracing grate-bars having rocking andlongitudinal reciprocatory motion to effect the rearward movement of thefuel on the grate, of a supporting-girder located at the rear of thegrate-bars which are pivv which arev pivoted IOO IIO

grate, and a ledge or ridge oi refractory material supported on saidgirder and overhanging the rear end of said grate.

31. A grate embracing two sets of rocking and endwise-movablegrate-bars, arranged in parallel rows with the rows of one set inalternation with those oi the other set, means for supporting andactuating said grate-bars, embracing two sets oi parallelsupportingbars, auxiliary grate-bars rigidly attached to the rear endsoi' said supporting-bars, and a stationary ridge or ledge located at therear of the grate and overhanging the rear margin of the same.

32. A grate embracing two bars arranged in parallel rows with the rowsof one set in alternation with those of the other set, means forsupporting said gratebars embracing parallel supporting-bars with whichthe grate-bars are movably connected, auxiliary grate-bars rigidlyattached to the rear ends of said supporting-bars, a supporting-girderat the rear of the grate and a ridge or ledge of refractory materialsupported on said girder and overhanging the rear margin of the grate.

33. A grate embracing two sets of gratebars arranged in parallel rowswith the rows oi one set in alternation with those of the other set,upper and lower sets of endwisesets of gratemovable supporting-bars bywhich the gratebars are sustained and actuated7 and means for sustainingsaid supporting-bars comprising transverse girders located below theupper and lower sets of supporting-bars, trackrails attached to saidtransverse girders and arranged longitudinally beneath the several barsand supporting-rollers engaging the said stationary track-rails and thelower edges oi said supporting-bars.

34. A grate comprising a row of rocking and endwise-movable grate-barsarranged in end-to-end relation, and supporting-arms detachablyconnected with said grate-bars by interlocking connections permittingseparation oi said parts by endwise movement of the bars relatively tothe arms, said bars being arranged for endwise engagement in theirnormal rocking movement, but being capable of abnormal rocking movementto release them Jfrom each other and permit their removal from saidarms.

In testimony that l claim the foregoing as my invention I affix mysignature, in presence of two witnessesl` this 15th day of September, A.D. 1904.

HERMAN A. POPPENHUSEN. Witnesses;

C. CLARENCE POOLE, W. L. HALL.

